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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <test.h>
  30. #include <arch.h>
  31. #include <arch/smp/atomic.h>
  32. #include <print.h>
  33. #include <proc/thread.h>
  34. #include <arch/types.h>
  35. #include <arch/context.h>
  36.  
  37. #include <synch/waitq.h>
  38. #include <synch/semaphore.h>
  39. #include <synch/synch.h>
  40.  
  41. static semaphore_t sem;
  42.  
  43. static spinlock_t lock;
  44.  
  45. static waitq_t can_start;
  46.  
  47. __u32 seed = 0xdeadbeaf;
  48.  
  49. static __u32 random(__u32 max);
  50.  
  51. static void consumer(void *arg);
  52. static void failed(void);
  53.  
  54. __u32 random(__u32 max)
  55. {
  56.     __u32 rc;
  57.  
  58.     spinlock_lock(&lock);  
  59.     rc = seed % max;
  60.     seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
  61.     spinlock_unlock(&lock);
  62.     return rc;
  63. }
  64.  
  65.  
  66. void consumer(void *arg)
  67. {
  68.     int rc, to;
  69.     waitq_sleep(&can_start);
  70.    
  71.     to = random(20000);
  72.     printf("cpu%d, tid %d down+ (%d)\n", CPU->id, THREAD->tid, to);
  73.     rc = semaphore_down_timeout(&sem, to);
  74.     if (SYNCH_FAILED(rc)) {
  75.         printf("cpu%d, tid %d down!\n", CPU->id, THREAD->tid);
  76.         return;
  77.     }
  78.    
  79.     printf("cpu%d, tid %d down=\n", CPU->id, THREAD->tid); 
  80.     thread_usleep(random(30000));
  81.    
  82.     semaphore_up(&sem);
  83.     printf("cpu%d, tid %d up\n", CPU->id, THREAD->tid);
  84. }
  85.  
  86. void failed(void)
  87. {
  88.     printf("Test failed prematurely.\n");
  89.     thread_exit();
  90. }
  91.  
  92. void test(void)
  93. {
  94.     context_t ctx;
  95.     __u32 i, k;
  96.    
  97.     printf("Semaphore test #2\n");
  98.    
  99.     waitq_initialize(&can_start);
  100.     semaphore_initialize(&sem, 5);
  101.    
  102.  
  103.    
  104.     for (; ;) {
  105.         thread_t *thrd;
  106.        
  107.         k = random(7) + 1;
  108.         printf("Creating %d consumers\n", k);
  109.         for (i=0; i<k; i++) {
  110.             thrd = thread_create(consumer, NULL, TASK, 0);
  111.             if (thrd)
  112.                 thread_ready(thrd);
  113.             else
  114.                 failed();
  115.         }
  116.        
  117.         thread_usleep(20000);
  118.         waitq_wakeup(&can_start, WAKEUP_ALL);
  119.     }      
  120.  
  121. }
  122.